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JavaScript: change a webpage background image tutorial

When you want to change a webpage background image using JavaScript, you can do so by setting the background image of the document object model (DOM) property.

The property you need to manipulate for changing the background image of the whole page is document.body.style.backgroundImage :

You need to put the relative path to the image from your web page’s folder. If the image is located in the same folder, then you can reference it directly inside the url() function as in the code above.

When the image is one folder down, add the correct relative path as follows:

Or go up one folder with the following relative path:

If you have the image URL available publicly on the internet, you can pass the full url into the property as in the following example:

 The code above will change the background image into an image that I have created for my website. You can test the code out by changing the image of Google’s homepage. First, open your browser’s developer console. Then in the Console tab next to Elements tab, write the following code:

The background image of Google’s homepage will change to the specified image, just like in the screenshot below:

By default, the image you selected as a background will be repeated to cover the whole page. You may want to style the background image further by setting the background-repeat style to «no-repeat» and the background-size style to «cover» .

To add the extra styles using JavaScript, you need to set the style property, which contains the same styling property but with a camelCase instead of kebab-case . For example, background-repeat becomes backgroundRepeat :

Inside your web application, you may want to trigger the background image change when the visitors do something. For example, you can change the background image when a is clicked:

If you want to wait until the page and the resources are fully loaded, you can listen for the load event instead:

The document.body code means you are selecting the tag of your HTML page. You can also change only a part of your page by selecting only that specific element.

• getElementById() — get a single element with matching id attribute
• getElementsByClassName() — get elements with matching class attribute
• getElementsByName() — get elements with matching name attribute
• getElementsByTagName() — get elements with matching tag name like «li» for
• , «body» for

The most recommended approach is to use getElementById() because it’s the most specific of these methods. Out of the four methods, only getElementById() will retrieve a single element.

The following example shows how you can change the background of element with id=»user» attribute:

 And that’s how you change the background image of a webpage using JavaScript 😉

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38 JavaScript Background Effects

Collection of hand-picked free vanilla JavaScript background effect code examples: change background color or image, animated, with canvas and etc. Update of February 2020 collection. 24 new items.

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How to set a background image in java

Having the plain background makes the project look old fashion. So I am writing this post to tell how to set a background image in a java project.

Firstly I discuss how it will be done on an IDE like Netbeans and then how it will be done using code.

Setting background image using Netbeans IDE

Create a JFrame form file and set the layout of the JFrame to Absolute Layout.

Now add a JLabel to store the image, which will act as the background later.

Click here to know how to add an image in java.

After adding the image and resizing it to the desired size(it should be of the JFrame size).

You can add other components to it but you will notice that it will not be visible as you add it to the JFrame.

Actually, it is behind the JLabel on which the image is set. So to get the component in front of the JLabel, we have to move the JLabel to the back.

To do that left click on the image JLabel then select «Move Down». Now the component will be visible.

This way you can create a JFrame having any number of components with a cool background.

Now let’s see how it will be done using code.

Setting background image using Code

Using this method is quite easy and smooth. You just have to add a small code snippet and you are good to go.

Use this code to put a background image on the JFrame.

setContentPane(new JLabel(new ImageIcon("F:\\spiderlab\\netbeans data\\Projects\\spiderlabweb\\src\\spiderlabweb\\pic.png"))); setLayout(new FlowLayout()); JButton b = new JButton("hello spider"); add(b); pack();

Include the code in the constructor of JFrame.

And then you can add components on to the JFrame.

Amit Rawat

I love to work on new projects and also work on my ideas. My main field of interest is Web Development.

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